Occurrence and characterization of methicillin-resistant staphylococci from bovine mastitis milk samples in Finland

Table 2 Characteristics of the methicillin-resistant S. epidermidis (MRSE) from bovine mastitis of the study (n = 18)

PFGE Cluster	Isolate no.	Oxacillin MIC (μg/ml)*	Antimicrobial resistance profile*	β-lactamase disk test	BlaZ gene	SCCmec type (*ccr* type, *mec* class)
A	658	>4	PEN, OXA	+	+	IV (2B)
B	1314	>4	PEN, OXA	-	+	NT (2 -)
C₁	1018	>4	PEN, OXA, TET, ERY	+	+	IV (2B)
C₁	1289	4	PEN, OXA, TET	+	+	IV (2B)
C₁	1439	4	PEN, OXA, TET, CHL	+	+	IV (2B)
C₁	1834	>4	PEN, OXA, TET	+	+	IV (2B)
C₁	2156	>4	PEN, OXA, TET	+	+	IV (2B)
C₁	28 VT	>4	PEN, OXA, TET	+	+	IV (2B)
C₂	1532	>4	PEN, OXA, TET	+	+	IV (2B)
C₃	1391**	4	PEN, OXA, TET	+	+	IV (2B)
C₃	1409**	4	PEN, OXA, TET	+	+	IV (2B)
C₄	775	>4	PEN, OXA, TET	+	+	V (5C2)
D₁	641	4	PEN, OXA, TET	+	+	IV (2B)
D₁	1750	>4	PEN, OXA, TET	-	-	IV (2B)
D₂	990	>4	PEN, OXA, TET	+	+	NT (2,5C2)
E₁	9	2	PEN, OXA, TET, ERY	+	+	NT (2,5B)
E₂	1222	>4	PEN, OXA, TET, ERY	+	+	NT (− −)
F	922	>4	PEN, OXA	+	+	IV (2B)

Penicillin PEN, oxacillin OXA, tetracycline/oxytetracycline TET, erythromycin ERY, chloramphenicol CHL.
* Based on the results from Pitkälä et al. 2004 (Survey material), except for isolate 28 VT, which is from the Ambulatory Clinic material.
** Isolates originated from the same farm.
NT Non-typeable using the method described.

ISSN: 1751-0147